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Noknroll

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A friend asked if i know anything about knock sensors used for combustion engine ignition timing. He described it as a mounted device used to listen for pinging in the combustion cycle to assist the engine tuner in gaining the optimum settings. Is anyone familiar with this technology and could it be an ultrasound device?
OLi

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Sort of but those I played with was used at a specific freq. like a SPM sensor but there may be others...... Bosch naturally have several versions but there was a German uni offspring the was gobbled up by FAG that had a patent for bearing condition use but it is maybe expired it was some time ago.
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Walt Strong

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A knock sensor typically senses well below 20-kHz (many below 1000-Hz), so I would not define it as an ultrasound sensor. There are several types of knock sensor designs, so I suggest a Web search. The General Motors (GM) design is quite different from others, but still uses a piezo crystal. There is also an ionized gas sensor that does not use vibration or sound detection methods. If you do have an ultrasound meter, then you might still get a response difference when knocking occurs. I recommend doing your testing on an engine or chassis dyno instead of running along side on of the car at a drag strip or at race track!

Walt
Noknroll

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Reply with quote  #4 
Thanks Walt, good tip with the not running alongside car thing.
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